Jury-shaft for propellers



(NoModeL) T. P. O. HALSEY. JURY SHAFT FOR PROPELLERS.

No. 455,964. Patented July 14,1891.

, UNITED STATES. PATENT OFFICE.

THOMAS P. O. HALSEY, OF JERSEY CITY, NElV JERSEY.

JUR Y-SHAFT FOR PROPELLERS.

SPECIFICATION forming part of Letters Patent No. 455,964, dated July 14,1891. Application filed January 6, 1891. Serial No. 376,865. (No model.)

To all whom it may concern:

Be it known that I, THOMAS P. O. HALSEY, a citizen of the United States,residing at J ersey City, in the county of Hudson and State of NewJersey, have invented a Jury-Shaft for Propellers, of which thefollowing is a specification.

In sea-goin g vessels the long propeller-shaft extending from the engineto the propeller is subjected to very great strain and is liable tobecome broken, especially between the bearing that is adjacent to thepropeller and the bearing that is adjacent to the engine, and there islittle or no opportunity at sea to repair the broken shaft or tomaintain the movement of the propeller sufficiently to cause the vesselto obey the helm.

My present invention is available for moving the propeller, after theshaft may have become broken, sufficiently for causing the vessel toobey the helm and to continue her course, but at a slower speed.

With this object in view I provide a shaft running parallel, or nearlyso, with the propeller-shaft and of a smaller size and a gearwheel andpinion, the wheel being connected with the propeller-shaft at a placewhere the shaft is not liable to be broken, such second or jury shaftbeing provided with movable connections .to the engine, so as to bebrought into action With facility after the connection to the mainpropeller-shaft has been severed.

In the drawings, Figure 1 is a longitudinal section of a portion of avessel representing my improvement diagrammatically,and Fig. 2is anelevationillustrating a connection that may be made from the engine tothe juryshaft.

The propeller A is of any desired character, and the shaft B of the sameextends to the engine 0. I have illustrated the engine as direct-acting,with the cylinder over the crank. The bearings for the propeller-shaftare to be placed in suitable positions. I have represented bearings at DE F G, and I have shown a jury-shaft H supported in suitable bearingsand parallel to the shaft 13, and this j ury-shaft H-will be muchsmaller than the pr0peller-shaftl3 in consequence of providing upon thepropeller-shaftB a gear-wheel K of as large diameter as consistent withthe space into which it is to be introduced, and a pinion L upon theshaft H of smaller diameter. Hence there is a leverage of the shaft Hand pinion L in driving the propeller whenever the pinion L is in gearwith the wheel K and the-power is communicated through the shaft H. Itis now to be understood that this pinion L can be slipped endwise uponthe shaft H or with the shaft, so as to bring this pinion into actionwith the gear-wheel K whenever necessary so to do in consequence ofbreakage in the propeller-shaft B. The connections between thejury-shaft H and the engine C may vary according to the character of theengine.

I have represented a gear-wheel M upon the propeller-shaft B adjacent tothe crank N and a pinion P upon the shaft H, that can be brought intogear with the wheel M when the jury-shaft H is employed. In thisinstance the relative sizes of the pinion P and wheel M should beadapted to running the engine at a slower speed than usual to lessen therisk of further injury. It will, however, be apparent that in case ofbreakage in the crank N or its pin or in case the propellershaft breaksat the crank N the wheel M will not be available, and in that instanceit is preferable to provide upon the cross-head Q of the engine awrist-pin and connecting-rod S to a crank R upon the j ury-shaft H, sothat such juryshaft H may be revolved directly from the cross-head ofthe engine. The details of construction in these cases, however, willvary according to the character of the engine and the location of therespective parts.

I claim as my invention 1. The combination, with the propellershaft andpropeller, of the jury-shaft extending from near the propeller to theengine, parallel, or nearly so, with the propeller-shaft, and

movable gearing for connecting the j ury-shaft I and thepropeller-shaft, and a movable connection between the jury-shaft and theengine, substantially as set forth.

2. The combination, with the propellershaft and propeller, of agear-wheel upon the propeller-shaft near the propeller, a j ury-shaftextending from near the propeller to near the engine, a movable pinionto connect the jury- IOO ' shaft and the gear-Wheel, and movable consuchgear-wheel adjacent to the crank, sub- 10 nections between thejury-shaft and the enstanti'ally as set forth.

gine, substantially as set forth. Signed by me this 30th day ofDecember,

3. The combination, with the propeller- 1890. r 5 shaft and propeller,of a ury-shaft, a gearj P. Q HALSEY Wheel on the propeller-shaft nearthe propeL 1er, and a gear-Wheel near to and connected Witnesses:

with the crank of the engine, and a movable GEO. '1. PINOKNEY, pinionupon the jury-shaft to connect withv HAROLD SERRELL.

